COCORP Arizona transect: Strong crustal reflections and offset Moho beneath the transition zone

Abstract

Research Article| December 01, 1987 COCORP Arizona transect: Strong crustal reflections and offset Moho beneath the transition zone E. C. Hauser; E. C. Hauser 1INSTOC (Institute for the Study of the Continents), Snee Hall, Cornell University, Ithaca, New York 14853 Search for other works by this author on: GSW Google Scholar J. Gephart; J. Gephart 1INSTOC (Institute for the Study of the Continents), Snee Hall, Cornell University, Ithaca, New York 14853 Search for other works by this author on: GSW Google Scholar T. Latham; T. Latham 1INSTOC (Institute for the Study of the Continents), Snee Hall, Cornell University, Ithaca, New York 14853 Search for other works by this author on: GSW Google Scholar J. Oliver; J. Oliver 2INSTOC and Department of Geological Sciences, Snee Hall, Cornell University, Ithaca, New York 14853 Search for other works by this author on: GSW Google Scholar S. Kaufman; S. Kaufman 2INSTOC and Department of Geological Sciences, Snee Hall, Cornell University, Ithaca, New York 14853 Search for other works by this author on: GSW Google Scholar L. Brown; L. Brown 2INSTOC and Department of Geological Sciences, Snee Hall, Cornell University, Ithaca, New York 14853 Search for other works by this author on: GSW Google Scholar I. Lucchitta I. Lucchitta 3U.S. Geological Survey, 2255 North Gemini, Flagstaff, Arizona 86001 Search for other works by this author on: GSW Google Scholar Geology (1987) 15 (12): 1103–1106. https://doi.org/10.1130/0091-7613(1987)15<1103:CATSCR>2.0.CO;2 Article history first online: 02 Jun 2017 Cite View This Citation Add to Citation Manager Share Icon Share Twitter LinkedIn Tools Icon Tools Get Permissions Search Site Citation E. C. Hauser, J. Gephart, T. Latham, J. Oliver, S. Kaufman, L. Brown, I. Lucchitta; COCORP Arizona transect: Strong crustal reflections and offset Moho beneath the transition zone. Geology 1987;; 15 (12): 1103–1106. doi: https://doi.org/10.1130/0091-7613(1987)15<1103:CATSCR>2.0.CO;2 Download citation file: Ris (Zotero) Refmanager EasyBib Bookends Mendeley Papers EndNote RefWorks BibTex toolbar search Search Dropdown Menu toolbar search search input Search input auto suggest filter your search All ContentBy SocietyGeology Search Advanced Search Abstract The Consortium for Continental Reflection Profiling (COCORP) transect across the southwest margin of the Colorado Plateau in Arizona reveals prominent subhorizontal zones of reflections, here termed the Bagdad reflection sequence (BRS), which dominate the upper and middle crust in the transition zone (TZ) between the Colorado Plateau and the Basin and Range province. A Cenozoic origin for the BRS is considered most likely; it may represent fragmented or sheared zones related to detachment faulting or a series of intrusions, possibly emplaced along preexisting zones of weakness. Moho reflections observed beneath the TZ and the Basin and Range province contrast with the nonreflective Moho beneath the Colorado Plateau, suggesting that extension and its associated igneous processes probably played a key role in the development of reflectors at the Moho. The Moho and a prominent midcrustal reflector are offset by about 3 km in a normal sense in at least one place; this is the best example of offset Moho yet found by COCORP and contrasts sharply with COCORP observations of a smooth Moho elsewhere. This offset is probably a late tectonic expression of crustal extension and thinning across the TZ. This content is PDF only. Please click on the PDF icon to access. First Page Preview Close Modal You do not have access to this content, please speak to your institutional administrator if you feel you should have access.